introduce reviewdog (#314)

* introduce reviewdog

* remove push trigger

* revert changes of lint.yml

* re-introduce reviewdog

Co-authored-by: Bryan Moffatt <bmoffatt@users.noreply.github.com>

.github/workflows/reviewdog.yml

@@ -0,0 +1,17 @@
+name: reviewdog
+on:
+  pull_request:
+
+jobs:
+  test:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v2
+
+      - name: golangci-lint
+        uses: reviewdog/action-golangci-lint@v1
+        with:
+          level: warning
+          reporter: github-pr-review